JP2022041057A - Manufacturing method of light-emitting module - Google Patents

Abstract

To provide a manufacturing method of a light-emitting module that can reduce the light loss near a light source.SOLUTION: A manufacturing method of a light-emitting module includes the steps of adhering a light-reflecting sheet having an opening for exposing a recess to the back surface of a light guide plate having a recess formed on the back surface on the opposite side of the light emitting surface, arranging a light source in the recess and fixing the light source to the light guide plate, and forming a light-reflecting resin in the opening of the light-reflecting sheet.SELECTED DRAWING: Figure 8

Description

The present invention relates to a method for manufacturing a light emitting module.

A light emitting module in which a light emitting element such as a light emitting diode and a light guide plate are combined is widely used as a planar light source such as a backlight of a liquid crystal display. For example, Patent Document 1 discloses a planar light source in which an LED mounted on a flexible printed substrate is arranged in a recess of a light guide plate and a reflective sheet having a hole for passing the LED is provided on the lower surface of the light guide plate. ..

Japanese Unexamined Patent Publication No. 2010-8837

An object of the present invention is to provide a method for manufacturing a light emitting module capable of reducing light loss in the vicinity of a light source.

According to one aspect of the present invention, in the method for manufacturing a light emitting module, a light reflective sheet having an opening for exposing the recess is adhered to the back surface of a light guide plate having a recess formed on the back surface opposite to the light emitting surface. A step of arranging a light source in the recess and fixing the light source to the light guide plate, and a step of forming a light-reflecting resin in the opening of the light-reflecting sheet are provided.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a method for manufacturing a light emitting module capable of reducing light loss in the vicinity of a light source.

It is a perspective view of the light emitting surface of the light emitting module of one Embodiment of this invention. It is a perspective view of the back surface of the light emitting module of one Embodiment of this invention. It is sectional drawing of the light emitting module of one Embodiment of this invention. It is sectional drawing of the light source in the light emitting module of one Embodiment of this invention. It is sectional drawing of the light source in the light emitting module of one Embodiment of this invention. It is sectional drawing which shows the manufacturing method of the light emitting module of one Embodiment of this invention. It is sectional drawing which shows the manufacturing method of the light emitting module of one Embodiment of this invention. It is sectional drawing which shows the manufacturing method of the light emitting module of one Embodiment of this invention. It is sectional drawing which shows the manufacturing method of the light emitting module of one Embodiment of this invention. It is sectional drawing which shows the manufacturing method of the light emitting module of one Embodiment of this invention. It is sectional drawing which shows the manufacturing method of the light emitting module of one Embodiment of this invention. It is sectional drawing which shows the manufacturing method of the light emitting module of one Embodiment of this invention. It is a perspective view which shows the manufacturing method of the light emitting module of one Embodiment of this invention.

Hereinafter, embodiments will be described with reference to the drawings. Since each drawing schematically shows an embodiment, the scale, spacing, or positional relationship of each member is exaggerated, a part of the member is omitted, or the end face showing only the cut surface as a cross-sectional view. Figures may be used. In each drawing, the same components are designated by the same reference numerals. Further, the "planar view" in the present disclosure means viewing from the light emitting surface side or the back surface side of the light guide plate.

FIG. 1A is a perspective view of a light emitting surface of the light emitting module 1 according to the embodiment of the present invention. FIG. 1B is a perspective view of the back surface of the light emitting module 1. FIG. 2 is a cross-sectional view of the light emitting module 1.

The light emitting module 1 includes a light guide plate 10, a light source 20, a light reflecting sheet 40, a light reflecting resin 43, a light adjusting member 44, and a first light transmitting member 31.

The light from the light source 20 is guided to the light guide plate 10, and the light guide plate 10 has transparency to the light emitted by the light source 20. The transmittance of the light guide plate 10 with respect to the light emitted by the light source 20 is, for example, preferably 80% or more, and more preferably 90% or more. The light source 20 has a light emitting element 22. The light emitted by the light source 20 includes the light emitted by the light emitting element 22. When the light source 20 includes a phosphor, the light emitted by the light source 20 also includes the light emitted by the phosphor.

As the material of the light guide plate 10, for example, a thermoplastic resin such as acrylic, polycarbonate, cyclic polyolefin, polyethylene terephthalate or polyester, a thermosetting resin such as epoxy or silicone, or glass can be used.

The light guide plate 10 has a light emitting surface 11 of the light emitting module 1 and a back surface 12 on the opposite side of the light emitting surface 11. Further, the light guide plate 10 has a recess 13 (hereinafter referred to as a first recess) formed on the back surface 12. The first recess 13 has an opening on the back surface 12 side.

The thickness of the light guide plate 10 is preferably, for example, 200 μm or more and 800 μm or less. The light guide plate 10 may be composed of a single layer or a laminated body of a plurality of layers in the thickness direction thereof. When the light guide plate 10 is composed of a laminated body, a translucent adhesive member may be arranged between the layers. Different types of main materials may be used for each layer of the laminate. As the material of the adhesive member, for example, a thermoplastic resin such as acrylic, polycarbonate, cyclic polyolefin, polyethylene terephthalate, or polyester, or a thermosetting resin such as epoxy or silicone can be used.

A light-reflecting sheet 40 is adhered to the back surface 12 of the light guide plate 10 via, for example, a translucent adhesive sheet. The adhesive sheet may contain a light diffusing agent. The light-reflecting sheet 40 includes a first light-reflective sheet 41 and a second light-reflective sheet 42. The first light-reflecting sheet 41 and the second light-reflective sheet 42 are also bonded to each other via, for example, an adhesive sheet. The second light-reflecting sheet 42 is arranged outside the first light-reflective sheet 41 and covers the first light-reflective sheet 41 in a plan view.

The light-reflective sheet 40 includes a laminated portion of the first light-reflective sheet 41 and the second light-reflective sheet 42, and a single-layer portion of the second light-reflective sheet 42. The monolayer portion is arranged outside the laminated portion in a plan view. In the laminated portion, the first light-reflecting sheet 41 is located between the back surface 12 of the light guide plate 10 and the second light-reflecting sheet 42.

The first light-reflecting sheet 41 has, for example, a laminated film of a plurality of insulating films. As this insulating film, for example, a polyester resin can be used. The first light reflective sheet 41 does not contain a light diffusing agent. Alternatively, the content of the light diffusing agent (weight percent) in the first light reflecting sheet 41 is lower than that of the light diffusing agent (weight percent) in the second light reflecting sheet 42.
The second light-reflecting sheet 42 is, for example, a white resin containing a light diffusing agent or a resin sheet on which a large number of bubbles are formed. As the resin of the base material, polyethylene terephthalate or the like can be used. The specular reflectance of the first light-reflecting sheet 41 is higher than the specular reflectance of the second light-reflecting sheet 42. The diffuse reflectance of the second light-reflecting sheet 42 is higher than the diffuse reflectance of the first light-reflecting sheet 41.

The light source 20 is arranged in the first recess 13 of the light guide plate 10 via the first translucent member 31.
FIG. 3A is a cross-sectional view of an example of the light source 20.

The light source 20 may be a single light emitting element 22 or, as shown in FIG. 3A, may have a structure in which the light emitting element 22 is combined with the second translucent member 24. The light source 20 may further include a covering member 25.

The light emitting device 22 includes a semiconductor laminate and a pair of positive and negative electrodes connected to electricity to the semiconductor laminate. The semiconductor laminate includes, for example, a support substrate such as sapphire or gallium nitride, an n-type semiconductor layer and a p-type semiconductor layer arranged on the support substrate, and a light emitting layer sandwiched between them. Further, the pair of positive and negative electrodes includes an n-type semiconductor layer and a p-type semiconductor layer, and an n-side electrode and a p-side electrode electrically connected to each other, respectively. As the semiconductor laminate, a semiconductor laminate from which the support substrate has been removed may be used. The structure of the light emitting layer may be a structure having a single active layer such as a double heterostructure or a single quantum well structure (SQW), or a group of activities such as a multiple quantum well structure (MQW). It may be a structure having a group. The light emitting layer can emit visible light or ultraviolet light. The light emitting layer can emit light from blue to red as visible light. As the semiconductor laminate including such a light emitting layer, for example, In _x Aly Ga _{1-x-y N} (0 ≦ x, 0 ≦ y, x + y ≦ 1) can be included.

The semiconductor laminate can include at least one light emitting layer capable of emitting the above-mentioned light emitting color. For example, the semiconductor laminate may have a structure including one or more light emitting layers between the n-type semiconductor layer and the p-type semiconductor layer, or may include an n-type semiconductor layer, a light emitting layer, and a p-type semiconductor layer. The structure included in order may be a structure in which the structure is repeated a plurality of times. When the semiconductor laminate contains a plurality of light emitting layers, the semiconductor laminate may include light emitting layers having different emission colors, or may include light emitting layers having the same emission color. It should be noted that the same emission color may have a variation of about several nm in a range that can be regarded as the same emission color in use, for example, the main wavelength. The combination of emission colors can be appropriately selected. For example, when the semiconductor laminate includes two light emitting layers, the combination of emission colors includes blue light and blue light, green light and green light, and red light and red light. , Ultraviolet light and ultraviolet light, blue light and green light, blue light and red light, green light and red light, and the like. Further, the light emitting layer may include a plurality of active layers having different emission colors, or may include a plurality of active layers having the same emission color.

The second translucent member 24 covers the upper surface and the side surface of the light emitting element 22. The second translucent member 24 protects the light emitting element 22 and has functions such as wavelength conversion and light diffusion depending on the particles added to the second translucent member 24. Specifically, the second translucent member 24 has translucency with respect to the light emitted by the light source 20, and for example, a translucent resin such as silicone or epoxy can be used.

Further, the second translucent member 24 may further contain a fluorescent substance. Examples of the phosphor include an yttrium aluminum garnet phosphor (for example, Y ₃ (Al, Ga) ₅ O ₁₂ : Ce) and a terbium aluminum garnet phosphor (for example, Lu ₃ (Al, Ga) ₅ O). ₁₂ : Ce), terbium aluminum garnet phosphor (eg, Tb ₃ (Al, Ga) ₅ O ₁₂ : Ce), β-sialon phosphor (eg, (Si, Al) ₃ (O, N) ₄ : Eu), α-sialon phosphor (eg, Mz (Si, Al) ₁₂ (O, N) ₁₆ (where 0 <z≤2, M excludes Li, Mg, Ca, Y, and La and Ce. Phosphorate element)), a nitride-based phosphor such as a CASN-based phosphor (eg, CaAlSiN ₃ : Eu) or a SCASN-based phosphor (eg, (Sr, Ca) AlSiN ₃ : Eu), a KSF-based phosphor (eg,). A fluoride-based phosphor such as K ₂ SiF ₆ : Mn) or an MGF-based phosphor (for example, 3.5 MgO, 0.5 MgF ₂ , GeO ₂ : Mn), a quantum dot phosphor, or the like can be used. As the fluorescent substance added to the second translucent member 24, one type of fluorescent material may be used, or a plurality of types of fluorescent materials may be used.

The covering member 25 is arranged at least on the lower surface side of the light emitting element 22, and at least a part of the surface (lower surface in FIG. 3A) of the electrodes 23 electrically connected to the pair of positive and negative electrodes of the light emitting element 22 is the covering member 25. Arranged to be exposed from. The covering member 25 covers the lower surface of the second translucent member 24 and the side surface of the electrode 23.

The covering member 25 has reflectivity to the light emitted by the light source 20. The covering member 25 is, for example, a white resin containing a light diffusing agent. Examples of the light diffusing agent include particles such as TiO ₂ , SiO ₂ , Al ₂ O ₃ , ZnO, and glass. Examples of the base material of the white resin include silicone resin, epoxy resin and acrylic resin.

Further, the light source 20 may include a light reflecting member on the entire surface or a part of the upper surface of the second translucent member 24 of the light source 20 shown in FIG. 3A. The light-reflecting member is a white resin that has reflectivity and translucency with respect to the light emitted by the light emitting element 22, and contains, for example, a light diffusing agent. The light-reflecting member can diffusely reflect a part of the light emitted in the direction directly above the light-emitting element 22, and reduce the uneven brightness in the light-emitting surface of the light-emitting module 1.

As shown in FIG. 2, the first translucent member 31 is arranged in the first recess 13 of the light guide plate 10. The first translucent member 31 has translucency with respect to the light emitted by the light source 20, and is, for example, a translucent resin such as silicone or epoxy. Further, the first translucent member 31 may contain a fluorescent substance. The phosphor is a wavelength conversion substance that is excited by the light emitted by the light emitting element 22 and emits light having a wavelength different from the wavelength of the light emitted by the light emitting element 22.

The first translucent member 31 covers the upper surface and the side surface of the light source 20. Further, the first translucent member 31 covers the inner surface (side surface and bottom surface) of the first recess 13. The light source 20 is fixed to the light guide plate 10 by the first translucent member 31.

The light adjusting member 44 is arranged above the first recess 13 on the light emitting surface 11 of the light guide plate 10. The light adjusting member 44 has reflectivity and translucency with respect to the light emitted by the light source 20. The light adjusting member 44 can include a translucent resin and a light diffusing agent dispersed and contained in the translucent resin. The translucent resin is, for example, a silicone resin or an epoxy resin. Examples of the light diffusing agent include particles such as TiO ₂ , SiO ₂ , Al ₂ O ₃ , and ZnO.

The light adjusting member 44 is arranged in the center of the light emitting surface 11, and the light source 20 is located below the light adjusting member 44. The light adjusting member 44 diffusely reflects a part of the light emitted in the direction directly above the light source 20 and transmits the other part. As a result, it is possible to suppress the brightness of the region directly above the light source 20 from becoming extremely high as compared with the brightness of the other regions, and it is possible to reduce the brightness unevenness in the light emitting surface of the light emitting module 1.

A light reflective resin 43 is arranged around the first recess 13 on the back surface 12 of the light guide plate 10. The light reflective resin 43 is a white resin containing a light diffusing agent in a resin such as silicone or epoxy. Examples of the light diffusing agent include particles such as TiO ₂ , SiO ₂ , Al ₂ O ₃ , and ZnO.

The light-reflecting resin 43 is also arranged at a position overlapping the first recess 13 in a plan view. Specifically, the light-reflecting resin 43 covers the lower surface of the first translucent member 31 arranged in the first recess 13. A part of the light source 20 is arranged outside the first recess 13, and a light reflecting resin 43 covers a part of the side surface of the light source 20.

The light-reflecting sheet 40 is located on the back surface 12 side of the light guide plate 10 and is arranged outside the light-reflecting resin 43 in a plan view. A laminated portion of the first light-reflecting sheet 41 and the second light-reflecting sheet 42 is arranged around the light-reflecting resin 43, and a single layer of the second light-reflecting sheet 42 is further arranged around the laminated portion. The parts are arranged.

The wiring 51 is arranged on the lower surface of the light reflective resin 43. The lower surface of the electrode 23 electrically connected to the light emitting element 22 is exposed from the light reflecting resin 43 and connected to the wiring 51. A pair of wirings 51 connected to each of the pair of positive and negative electrodes 23 are arranged, and the pair of wirings 51 are separated from each other on the lower surface of the light-reflecting resin 43.

As shown in FIG. 1B, an insulating film 61 is arranged on the lower surface of the light-reflecting resin 43. The insulating film 61 covers the outer peripheral portion of the wiring 51. The portion inside the outer peripheral portion of the wiring 51 is exposed from the insulating film 61. The insulating film 61 is provided between the pair of wirings 51 to improve the insulating property between the pair of wirings 51.

The light emitted from the light source 20 is incident on the light guide plate 10, and is guided through the light guide plate 10 while repeating total reflection between the light reflective sheet 40 and the light emitting surface 11. A part of the light directed to the light emitting surface 11 is taken out from the light emitting surface 11 to the outside of the light guide plate 10.

At the interface between the back surface 12 of the light guide plate 10 and the light-reflecting sheet 40, a first light-reflecting sheet 41 having a higher specular reflectance than the second light-reflecting sheet 42 is arranged in a region closer to the light source 20. There is. Specifically, in the cross-sectional view, the first light reflective sheet 41 is arranged on the light source 20 side of the back surface 12 of the light guide plate 10. Further, a second reflective sheet 42 is arranged on the lower surface of the first reflective sheet 41. Therefore, in the region where the first light-reflecting sheet 41 is arranged, total reflection is easy, and the light-guiding action of spreading the light in the light-guiding plate 10 is the main.

On the other hand, in a region outside the first light-reflecting sheet 41 in a plan view, a second light-reflecting sheet 42 having a higher diffuse reflectance than the first light-reflecting sheet 41 is arranged. Therefore, in the region outside the first light-reflecting sheet 41, the light guidance due to total reflection is suppressed as compared with the region where the first light-reflecting sheet 41 is arranged, and the light from the light emitting surface 11 due to diffuse reflection is suppressed. Mainly taken out.
Further, in FIG. 4, in the cross-sectional view, the second reflective sheet 42 has an integral sheet in which the region arranged on the lower surface of the first reflective sheet 41 and the region arranged on the outer side of the first reflective sheet 41 are integrated. However, it is not limited to this. For example, in the second reflective sheet 42, the region arranged on the lower surface of the first reflective sheet 41 and the region arranged on the outer side of the first reflective sheet 41 may not be connected and may be separate sheets.

By combining the first light-reflecting sheet 41 and the second light-reflecting sheet 42 having different reflection characteristics, it is possible to improve the efficiency of extracting light from the light emitting surface 11 while ensuring the light guide property.

In the peripheral region of the first recess 13 in which the light source 20 is arranged, the interface between the light adjusting member 44 and the light guide plate 10 is inclined with respect to the light emitting surface 11. Therefore, a part of the light emitted upward in the peripheral region of the light source 20 is reflected at the inclined interface between the light adjusting member 44 and the light guide plate 10 and heads laterally. That is, a part of the light directed upward in the peripheral region of the light source 20 is converted into a component that guides the inside of the light guide plate 10, and it is possible to suppress the upper region of the light source 20 from becoming too bright while reducing the light loss. ..

In the region closer to the light source 20 (the peripheral region of the light source 20) inside the region where the light reflective sheet 40 is arranged on the back surface 12 of the light guide plate 10, the light reflecting resin 43 emits light directed downward. It can be reflected to the surface 11 side, and the light that escapes downward can be suppressed. Therefore, the light loss in the vicinity of the light source can be reduced, and the brightness of the light extracted from the light emitting surface 11 can be improved.

Next, a method of manufacturing the light emitting module 1 of the embodiment will be described with reference to FIGS. 4 to 11.

The method for manufacturing the light emitting module 1 of the embodiment includes a step of preparing the laminated body 101 shown in FIG. The step of preparing the laminated body 101 includes a step of preparing the light guide plate 10 and a step of adhering the light reflecting sheet 40 to the back surface 12 of the light guide plate 10. The step of preparing the laminated body 101 may be prepared by purchasing the laminated body 101 in which the light reflecting sheet 40 is arranged on the back surface 12 of the light guide plate 10.

The light guide plate 10 includes a light emitting surface 11 and a back surface 12 on the opposite side of the light emitting surface 11. A recess 14 (hereinafter referred to as a second recess) is formed on the light emitting surface 11, and a first recess 13 is formed on the back surface 12. The first recess 13 is formed at a position overlapping below the second recess 14 in a plan view of the light emitting surface 11.
The first recess 13 and the second recess 14 can be formed, for example, by preparing a mold corresponding to the shape of each recess in a plate-shaped light guide plate 10, sandwiching the light guide plate 10 with the mold, and pressing. At this time, the portion between the bottom surface and the back surface 12 of the second recess 14 in the light guide plate 10 so that the bottom surface of the second recess 14 is a concave surface and the surface overlapping the lower surface of the second recess 14 on the back surface 12 is a convex surface. Is transformed. The convex surface of the back surface 12 is located below the surface of the back surface 12 on which the light reflecting sheet 40 is arranged.

The light reflective sheet 40 is adhered to the back surface 12 of the light guide plate 10. The light reflective sheet 40 has an opening 40a that does not block the first recess 13 and exposes the first recess 13. The light reflective sheet 40 is adhered to the back surface 12 of the light guide plate 10 by, for example, an adhesive sheet. As the adhesive sheet, for example, an epoxy resin, an acrylic resin, an olefin resin, or the like can be used.

In a plan view, the back surface 12 of the light guide plate 10 is adhered to the first light reflective sheet 41 via an adhesive sheet on the inside and the second reflective sheet 42 on the outside when the light source 20 is the center of the back surface 12. And adhere via an adhesive sheet. Further, in the cross-sectional view, the lower surface of the first reflective sheet 41 is covered with the second reflective sheet 42.

The first light reflective sheet 41 has a first opening 41a forming the opening 40a. In the example shown in FIG. 4, a part of the second light-reflecting sheet 42 covers the first light-reflecting sheet 41. A step is formed between the portion of the second light-reflecting sheet 42 bonded to the back surface 12 and the portion covering the first light-reflecting sheet 41 (the portion laminated on the first light-reflecting sheet 41). Ru. The portion of the second light-reflecting sheet 42 that covers the first light-reflective sheet 41 has a second opening 42a that overlaps the first opening 41a of the first light-reflective sheet 41. The opening 40a of the light reflective sheet 40 is formed by the first opening 41a and the second opening 42a.

As shown in FIG. 5, a light adjusting member 44 is formed in the second recess 14 of the light emitting surface 11. For example, a translucent resin containing a light diffusing agent is supplied to the second recess 14 in a state of having fluidity, and then cured to form a light adjusting member 44.

As shown in FIG. 6, a first translucent member 31 is formed in the first recess 13 of the back surface 12. For example, the first translucent member 31 is supplied to the first recess 13 in a state of having fluidity. The first translucent member 31 may contain a fluorescent substance.
It is preferable that the first translucent member 31 supplies the first recess 13 with an amount equal to or smaller than the volume of the first recess 13.

As shown in FIG. 7, a light source 20 is arranged in the first recess 13. For example, after supplying the first translucent member 31 to the first recess 13, at least a part of the light source 20 is arranged in the uncured first translucent member 31. After that, the first translucent member 31 is cured. When the first translucent member 31 is cured, the light source 20 is settled in the first translucent member 31, and for example, the upper surface and the side surface of the light source 20 are covered with the first translucent member 31. The electrode 23 of the light source 20 is exposed from the first translucent member 31. The light source 20 is fixed to the light guide plate 10 by the first translucent member 31.

After fixing the light source 20 to the light guide plate 10, the light reflective sheet 40 may be adhered to the back surface 12 of the light guide plate 10. When the light reflective sheet 40 is adhered to the back surface 12 of the light guide plate 10 and then subjected to high temperature treatment to increase the adhesive force, light is applied to the back surface 12 of the light guide plate 10 in order to prevent heat damage to the light source 20. It is preferable that the light source 20 is fixed to the light guide plate 10 after the reflective sheet 40 is adhered and subjected to high temperature treatment.

The light reflective sheet 40 is formed with an opening 40a that exposes the first recess 13. Therefore, even after the light-reflecting sheet 40 is adhered to the back surface 12 of the light guide plate 10, the first translucent member 31 can be formed in the first recess 13 and the light source 20 can be arranged.

A part of the back surface 12 is exposed in the opening 40a so as to surround the light source 20. The light-reflecting resin 43 shown in FIG. 8 is formed on the back surface 12 in the opening 40a. For example, after filling the inside of the opening 40a with the light-reflecting resin 43 so as to cover the electrode 23 of the light source 20 and the first translucent member 31, the light-reflecting resin 43 is ground to reflect light on the surface of the electrode 23. It is exposed from the sex resin 43.

As shown in FIG. 9, the wiring 51 is formed on the surface of the light reflective resin 43. For example, the wiring 51 is formed by printing a metal paste on the surface of the light-reflecting resin 43. The wiring 51 is connected to the electrode 23 electrically connected to the light emitting element 22. The metal paste is also continuously formed between the pair of electrodes 23, and then separated between the pair of electrodes 23 by, for example, laser etching. A pair of wirings 51 connected to each of the pair of electrodes 23 are formed.

After forming the wiring 51, an insulating film 61 is formed on the surface of the light-reflecting resin 43 as shown in FIG. The insulating film 61 is formed so as to cover between the pair of wirings 51, and enhances the insulating property between the wirings 51.

The process described above is performed on the sheet-shaped light guide plate 10 shown in FIG. That is, a plurality of second recesses 14 are formed on the light emitting surface 11 of the light guide plate 10, a plurality of first recesses 13 are formed on the back surface 12 of the light guide plate 10, and a plurality of light reflective sheets 40 are formed on the back surface 12 of the light guide plate 10. The light adjusting member 44 is formed in each of the plurality of second recesses 14, and the first translucent member 31 is formed in each of the plurality of first recesses 13, and the plurality of first recesses are formed. A light source 20 is arranged in each of the recesses 13, and a light-reflecting resin 43 is formed in each opening 40a of the plurality of light-reflecting sheets 40.

After that, by cutting the light guide plate 10 so as to include at least one light source 20 and at least one light reflective sheet 40, the light emitting module 1 shown in FIGS. 1A, 1B, and 2 is formed. In addition, one light emitting module may include a plurality of light sources 20.

FIG. 3B is a cross-sectional view of another example of the light source. In this light source, the covering member 25 covers the side surface of the light emitting element 22. The second translucent member 24 covers the upper surface of the light emitting element 22 and the upper surface of the covering member 25. Further, the covering member 25 is arranged so that at least a part of the surface (lower surface in FIG. 3B) of the electrode 23 arranged on the lower surface side of the light emitting element 22 is exposed from the covering member 25. The covering member 25 covers the side surface of the electrode 23.

The light source does not include the second translucent member 24 and the covering member 25, and may be composed of the light emitting element 22.

The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. All embodiments that can be implemented by those skilled in the art with appropriate design changes based on the above-described embodiments of the present invention also belong to the scope of the present invention as long as the gist of the present invention is included. In addition, in the scope of the idea of the present invention, those skilled in the art can come up with various modified examples and modified examples, and these modified examples and modified examples also belong to the scope of the present invention.

1 ... light emitting module, 10 ... light guide plate, 11 ... light emitting surface, 12 ... back surface, 13 ... first recess, 20 ... light source, 22 ... light emitting element, 23 ... electrode, 24 ... second translucent member, 25 ... coating. Member, 31 ... First translucent member, 40 ... Light reflective sheet, 40a ... Opening, 41 ... First light reflective sheet, 42 ... Second light reflective sheet, 43 ... Light reflective resin, 44 ... Light Adjusting member, 51 ... Wiring

Claims (8)

A step of adhering a light-reflecting sheet having an opening for exposing the recess to the back surface of the light guide plate having a recess formed on the back surface on the opposite side of the light emitting surface.
A step of arranging a light source in the recess and fixing the light source to the light guide plate.
A step of forming a light-reflecting resin in the opening of the light-reflective sheet, and
A method of manufacturing a light emitting module equipped with. The step of fixing the light source to the light guide plate is
The step of supplying the first translucent member to the recess and
A step of arranging at least a part of the light source in the first translucent member and then curing the first translucent member.
The method for manufacturing a light emitting module according to claim 1. The method for manufacturing a light emitting module according to claim 2, wherein the phosphor is contained in the first translucent member. The method for manufacturing a light emitting module according to any one of claims 1 to 3, wherein the light reflective sheet is adhered to the back surface of the light guide plate, and then the light source is fixed to the light guide plate. Claims 1 to 4 wherein the light-reflecting sheet includes a first light-reflective sheet having the opening and a second light-reflective sheet arranged outside the first light-reflective sheet on the back surface. The method for manufacturing a light emitting module according to any one of the above. A plurality of the recesses are formed on the back surface of the light guide plate.
A plurality of the light-reflecting sheets are separated from each other and adhered to the back surface of the light guide plate.
The light source is arranged in each of the plurality of recesses, and the light source is arranged.
After forming the light-reflecting resin in the openings of the plurality of light-reflecting sheets, the light guide plate is cut so as to include at least one light source and at least one light-reflecting sheet. Item 6. The method for manufacturing a light emitting module according to any one of Items 1 to 5. The light source is
A light emitting element having an electrode on the lower surface side and
A second translucent member that covers the upper surface and the side surface of the light emitting element,
A covering member that covers the lower surface of the second translucent member and the side surface of the electrode of the light emitting element, and
The method for manufacturing a light emitting module according to any one of claims 1 to 6. The light source is
A light emitting element having an electrode on the lower surface side and
A second translucent member that covers the upper surface of the light emitting element,
A covering member that covers the side surface of the light emitting element and
The method for manufacturing a light emitting module according to any one of claims 1 to 6.

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